Process for producing 3-cyanomethyl cyclopentanone derivatives
申请人:Sagami Chemical Research Center
公开号:US04100184A1
公开(公告)日:1978-07-11
A process for producing 3-cyanomethyl cyclopentanone derivatives which are useful precursors of fragrant components in jasmine and analogous thereof such as methyl jasmonoate, methyl dihydrojasmonate, etc., is disclosed. In the process, the jasmonoates are produced starting from .beta.-dicarbonyl compounds and azides through several-step reactions.
Process for producing 3-formylcyclopentanone derivatives
申请人:(Zaidanhojin) Sagami Chemical Research Center
公开号:US04073799A1
公开(公告)日:1978-02-14
A novel process for producing 3-formylcyclopentanone derivatives which are useful intermediates for syntheses of five-membered ring compounds such as prostaglandins is disclosed. In the process, 3-formylcyclopentanone derivatives are produced starting from .beta.-dicarbonyl compounds and azides through several-step reactions.
Through a double cyclization triplet carbonylcarbenes add smoothly to double bonds in the δ and ε position, but do not react intramolecularly with C-H bonds (see scheme). The addition reaction fails if the keto group is replaced with an ester group.
Enantioselectively catalyzed intramolecular cyclopropanations of unsaturated diazo carbonyl compounds
作者:William G. Dauben、Robert T. Hendricks、Michael J. Luzzio、Howard P. Ng
DOI:10.1016/s0040-4039(00)97218-6
日期:1990.1
A series of unsaturated α-diazo carbonyl compounds underwent enantioselective intramolecularcyclopropanation (ee = 4–77%) when treated with an enantiomerically pure chiral copper catalyst. The nature of the diazo substrate was critical: α-diazo ketones gave the best enantioselectivities whereas α-diazo β-keto ester systems showed diminished enantioselectivities.
Process for producing allyl alcohol derivatives useful in prostaglandin
申请人:(Zaidanhojin) Sagami Chemical Research Center
公开号:US04094886A1
公开(公告)日:1978-06-13
A novel process for producing allyl alcohol derivatives having the formula ##STR1## wherein R.sup.1 represents a hydrogen atom or a lower alkyl group; and R.sup.2 represents an alkyl group which can have an inert substituent; and X represents a hydrogen atom, a hydroxy, an alkoxy, a tetrahydropyranyloxy or a silyloxy group; which are useful intermediates for the syntheses of prostaglandins and analogous compounds is disclosed. In the process, the allyl alcohol derivatives are produced starting from .beta.-keto-esters and azides through a series of reactions.